Blue flame oil burner



Oct. 4, 1938. 2,131,986

(1. M. STROUD BLUE FLAME OIL BURNER Filed Dec. 18, 1955 7a 6.. S troud Z5 ff% Patented Oct. 4, 1938 -BI5UEFLAME O-IL BURNER Charles'M. Stroud, Minneapolis, "Minn. Application-December 18,;1 935, Serial No. 55,018

' I "'6 claims, (01. "'158-8'6) This invention relates to a liquid fuel v:burn'er 'andzparticularly toian oil burner oifthe'blue'flame typ Such aburners i of the blue flame type usually comprise a mem'berhaving recesses with wicks therein 'to which oil-is supplied and perforated lcyli-nders extending above said member forming -.'annular passages communicating with said recesses 'throughwhich oil vapor'passes upwardly. In starting such burners the same have hereto- -fore burned with a-high red flame untilthe burner be'c'ame heated to a certain degree when a blue flame wouldbe produced.

'It has heretofore been "the practice to have a passage of rather large extent for vapor con'stan-t- 1y supplied with oil or vap'ori-andburning to constitute a pilot. 4

It is anobject 'of'this invention to provide a simple and "efficient construction ofblue flame burner in which'the'initial burning with a red flame is eliminated and in which' a blue flame can always be' 'hacl. I a

It is a 'further object of the inventionto provide a novel :and efficient means comprising a passage of small cross sectional area-for oil vapor, which vapor mixed withair can burn at'the top of said passage to form apilo't. F

It-is another 'object of the invention to provide a 'Eburn'er having a burner -meIriberf-with oil "recei-ving recesses therein and a Vaporizing'chamber extendin'g'below said recesses, a plurali'ty of superposeddis'ks of fibrous material' being disposed insaid chamber, which disksarepreferably provided with holes arranged in staggered relation in adjacent disks. I V

'It'is still another-object of the invention-to provide a burner having a novel form 'of baflle means at the'top of-the perforated or -screen'cylinders used together with novel'means for supporting such'bafile.

These and other objects andadvantages of the invention will be fully set forth in the following description 'made in connectionwith the accompanying drawing, in which'like reference characters refer to similar partsthroughout .the .several views and in which:

Fig. 1 is. a .vertical section taken. substantially on line,|.| of.Fig...'2 .asindicatedby the arrows;

.Eig. 2 is.a top .plan viewrof the burner with the baflie means removed;

Fig. 3.is a view inside elevation-of the member used in the vaporizing chamber; 7

Fig. .4 is a top planview of the-member shown in Fig. 3;

and

ig. Gris a section .taken" on'lin'e 26 6 .of Fig.5 as:indicatedibyfthe arrow.

Referring to ;the :drawinga burner structure :is shown :comprisingza member 1'0 .havingia plate- :Iike :bottom ithronghoutqnost of its extent from which project equally and circumferentially spacedand iapertured lugs tea adapted to "receive bolts to secure said member in place. Member H] hasiformedathereinuaupair of annular grooves Hibsand l llc'which- .e'xtendradjacent its outer edge in ra'diallyspacedrelation. The Walls extending about grooves .lllbwand 'lllcuare reduced in'thick- .ness and have forme'd'thereonshoulders' l M some Fig. 5': -is:a-:pla'n yiew'of 'oneiof the disks used;

cylindrical easing Ifigiwhich extends downward .quite'ia distance from the fiat bottom portion of member). :Casin'g lzflg has a chamber therein andithis communicates-through passages h with grooye'i-lzitc, passages lzllh being formed'in arms ifiz' which extend between the inner wall of groove 'IiSc-a'nd teasing 1.0g. :A cylindrical member l6 shown in Figsjfirande is disposed-i'n the chamber in :casing 40!]. .Member #6 isopen at'its upper end aiid its-bottom and 'side walls have thereina multiplicitypfzism'all holes [6a. "The bottom of member l6..is spaced a shortdistanoe from the bottom of the chamberin'casingilsdg. andsai'd casing :has at its lower :end :a threaded boss I07 adaptedtorrecei-Ve. a'fuel supply pipefor supplying .oil: to casing "1:09"; The memberilfi has disposed therein tquiteta number of disks 11. .One of these :diskslis showntini'Figs. Band Band it will be seen thatithezsamelhas exten'dingitherethrough a pillrality -;of equally "and circumierentially spaced holes 11111. When the disks 1.1 .:are arranged in member l6 as shown i-n' Fig. '1 the holes Ha. will be arranged i-n'staggered' relation. :A cap cmember l fi has an" exteriorlyithreaded flange screwed into the t'opofcasing lflylsothatrmemberw forms a coverforrsaid casing. .A rod-lz9 extends upwardly fromzazcentral bosstton member: l8,"the same having its lowerend'threa'ded -intotsaid boss and a vbaffle:member.2 llhasia. central :depending 'boss a with aiibore thereindntowhich rod l=9 extends so 2 l that bafile 20 rests on said rod. Baflle 20 has a depending cylindricalflange 20b which extends to a point slightly below the top of cylinders II to M. Bafile 20 has another cylindrical flange 200 which extends downwardly quite a distance below the top of cylinders |2 and I3 and substantially midway between the same. Baffle 20 has an inwardly and upwardly curved flange 20d at its central portion and a plurality of openings 2012 are formed between this flange and flange 2017, the space between said flanges 'beingalmost entirely open and only traversed by narrow ribs 20f. Bailie 20 also has an upwardly and outwardly extending outer flange 20g. Flanges 20d and 20g extend oppositely in symmetrical relation to depending flange 20c. The Outer cylinder II alsohas an upwardly and inwardly extending baffle member 2| supported on its upper end. This baffle member is of annular form extending entirely around cylinder H. A similar baffle 22 is supported on the upper end of inner cylinder |4,- this bafile extending upwardly and outwardly toward bafile 200. As shown in Fig. 1 baiiles 20:1, 200, 2| and 22 are of curved formation. .Bafile 2| has upstanding therefrom supporting lugs 2|a having V-shaped recesses in their upper ends and baffle member 2|] has circumferentially spaced legs 20h having V-shaped lower ends adapted to rest on the upper ends of lugs 2|a. Baffle 20 is thus additionally supported on bafile2|..

Member ID also has depending from one side a comparatively small cylindrical casing |||7c interiorly threaded at its lower end to receive'a fuel supply pipe indicated as. 23. A hole Him is formed in the bottom of groove 101) which extends into the chamber in casing |0k. A pair of platelike lugs Hm extend upwardly from the bottom of groove. IDb at each side of hole Him and between the walls vof groove Hib, said lugs extending to a line adjacent the top of said groove. A pair of perforated plates or screen members 24 are secured between screens H and |2 and extend to the bottom of said screen members just over .or adjacent the lugs I011, Members '24 have late erally extending lugs 24a. which-can be secured to the side of screen member 12 in any suitable manner as by welding. Lugs Mn and screen members 24 are spaced 'a-comparatively short distance circumferentially so that apassage of comparatively small area extends upward betweenscreens II and I2. i

In operation oil will be supplied through pipe 23 in suflicient' quantity to maintain oil in groove |0b between the lugs um which act as dams to confine a small reservoir of'oil between them in groove lllb. This oil will saturate the portion of wick 2 in said groove between lugs in and vapor will pass upwardly between rings H and I2 in the passage between members 24. This vapor will mix with air and the flame formed by the combustion of this vapor and air will burn at the top of said passageor at the top of rings II and I2. This flame will be a blue flame and will act as a pilot light for the burner. When the burner is to be used for heating, oil will be supplied to the bottom of casing ||ig and will pass through the holes in the bottom of member IE to the disks Some oil will also pass around the outer side of member l6 and through the holes in the side wall. thereof to the disks member 16 fitting rather loosely in casing ||lg.' The oil passes'up through the disks l1 and through the staggered holes I16! and flows out through passages lb and We to the grooves lb and |0c saturating the wicks l5. Vapor will pass upwardly in the passages between cylinders H and I2 and cylinders l3 and l4. It will be seen that the passages 25 between cylinders II and I2 and cylinders l3 and I4 thus form vapor passages while the passage 26 between cylinders l2 and I3 forms an air passage, this passage being open at the bottom of member ID except where it is closed by arms If.

The vapor passing upwardly in passages 25 is mixed with air which enters through the holes in the cylinders II to M and this mixture passes laterally from said passages through the outlets at the top of cylinders I2 and I3 and between' the same and the ends of bafiles 2| and 22. The. mixture then passes through a vertical outlet or passage at either side of baflle 200, which passages ture is ignited at the top of baffles 2|. and 22 and will burn here with a blue flame at all times. The area of the outlet openings between the top of cylinders l2 and I3 and the inner ends of baifie's 2| and 22 is substantially equal in area to the area of thepassages between the inner ends; of the baffles 2| and 22 and flange 200.

There is thus no choking of the flow of the mixture nor. any constriction of the passage. This results in the burner burning with a blue flame even when it is initially started. As above stated burners heretofore have usually burned for a time with a highred or yellow flame.

From the above descripion it is ,seen that applicant has provided a very'simple and efficient structure ofblue flame burner. By having the narrow passage or chimney effect between members 24 and screns H and I2, a pilot can be had which is clean and not smoky and which will burn with a blue flame. The flow of the combustible mixture is efiicientlycontrolled to secure a blue Baffle member 20 is supported so that it can be easily and quickly, removed. The action of the disks has been found in practice to be exceedingly efficient. The oil engaging these disks is, afterthe burner gets into operation, vaporized in member deposits in member H1 or about the wicks l5. Oil initially is supplied to the wicks burner begins operating and member l0 becomes heated, the oil in grooves H112 and lllc is vaporized and as stated no oil passes from casing lflg into the grooves. The oil is vaporized in passing through the disks so that only vaporized oil passes out through the passages Inn. This results in a great saving of the wicks which do not become encrusted with carbon at their tops. Cap l8 can be'removed when desired if the disks l! are to be replaced. The burner is simple in construction and the same has been amply demonstrated in actual practice and found to be very successful and efiicient. v

,It will, of course, be understood that various changes'maybe 'made in the form, details, ar-

rangement and'proportion's of the parts, without departing from the scopeof applicant's invention, which generally stated, consists in a device capable of carrying out the objects above set forth in the parts and combinations of parts dis closed and defined in the appended claims.

What is claimed is:

flame on the burner at all times.

l5. As the I6 so that there will be no. carbon 1. An oil burner of the blue flame type having in combination, a burner member having spaced annular grooves therein, means for supplying oil to said grooves, pairs of perforated cylinders extending upward from said member, the spaces between the cylinders of each pair forming vapor passages communicating with said grooves at their lower ends, the space between the adjacent cylinders of said pairs forming an air passage, bafiles at the top of said cylinders forming lateral outlets for said vapor passages respectively and baffle means cooperating with said bafiies to form vertical and lateral outlet passages above said lateral outlets, said last mentioned bafiie means having a depending portion extending into said air passage to divide the same to cause air to pass into said vertical passages in substantially equal Volume.

2. An oil burner of the blue flame type having in combination, a burner member having spaced annular grooves therein, means for supplying oil to said grooves, pairs of perforated cylinders extending upward from said member, the spaces between the cylinders of each pair forming vapor passages communicating with said grooves at their lower ends, the space between the adjacent cylinders of said pairs forming an air passage, baffles at the top of said cylinders forming lateral outlets for said vapor passages respectively and bafile means cooperating with said baffles to form vertical and lateral outlet passages above said lateral outlets, said last mentioned baiile means having a depending portion extending into said air passage forming a vertical outlet between the same and said first mentioned bafiles andhaving a top portion directing the vapor and air in opposite directions at each side of said depending portion.

3. An oil burner of the blue flame type having in combination, a burner member with a plurality of recesses therein, wicks in said recesses, burner rings above said recesses, said member having a vaporizing chamber extending below and communicating with said recesses, a plurality of superposed fiberdisks disposed in said chamber each having a plurality of holes therethrough arranged in staggered relation in adjacent disks and means for supplying oil to the bottom of said chamber.

4. An oil burner of the blue flame type having in combination, a burner member having a pair of radially spaced annular oil receiving grooves, two pairs of perforated cylinders extending upwardly from the walls of said grooves, the spaces between the cylinders of each pair forming vapor passages and the spaces between the pairs of said cylinders forming an air passage, baiile members supported on the outermost and innermost cylinders respectively at their upper ends and extending upwardly and toward each other in curved form, a battle member extending over all of said passages and having a cylindrical flange extending downwardly into said air passage to a point some distance below the top of said cylinders whereby the air and vapor in said vapor passages can pass laterally between the top of the two inner cylinders and the top of said first mentioned bafiles and then upwardly between said first mentioned baffles and said flange and outwardly beneath said second baflie.

5. An oil burner of the blue flame type having in combination, a burner member with a plurality of annular grooves therein, wicks in said grooves, perforated cylinders extending above said grooves, said member having a cylindrical vaporizing chamber extending below and in communication with said grooves, a screen extending about the wall of said chamber, a plurality of superposed fibrous disks fitting in said screen each having a plurality of holes therethrough arranged in staggered relation in adjacent disks and means for supplying oil to the bottom of said chamber.

6. An oil burner of the blue flame type having in combination,'a burner member having a pair of radially spaced annular oil-receiving grooves therein, two pairs of perforated cylinders extending upwardly respectively from the walls of said grooves, the spaces between the cylinders of each pair forming vaporizing passages and the space between the pairs of said cylinders forming an air passage, annular bafile members supported on the top of the outermost and innermost cylinders respectively and curved upwardly and toward each other with a space therebetween, a baflie member extending over all of said passages and having a trough-shaped annular top portion with an annular vertical flange depending therefrom midway between the edges of said first mentioned bafile members and extending downwardly into said air passage centrally thereof whereby the air and vapor in said vapor passages can pass laterally over the tops of the innermost cylinders upwardly between the edges of said first mentioned bafiie members and then outwardly and upwardly along the under side of said trough-shaped portion.

CHARLES M. STROUD. 

